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CMMG

CMMG 99D17C3 Replacement Barrel Kit with Bolt Carrier Group, 9mm Luger 5" Threaded, Black, Radial Delayed Blowback, Fits AR-Platform

Product Code : 815835019796

$391.99

Mfg Item #: 99D17C3

Available Online
Secure online ordering

CMMG's 9mm Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using CMMG's Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system. Their Barrel and Bolt Kits are designed to work exclusively with mil-spec AR-15 upper receivers with a modified ejection port, like their MkG/MkGs upper, and most mil-spec AR15 lowers when used with 9 AR Conversion mags as well as their MkGs Mk17 and Mk9* lowers. Other manufacturers receivers may work, but we cannot guarantee function or reliability.*Older Mk9 lowers will require one of their retrofit kits to convert it to a Radial Delayed Blowback compatible lower, instead of Traditional Blowback.

Width1.9500
FinishBLACK MATTE
Height1.9000
Length14.8000
SightsN
Caliber9MM LUGER
ThreadedY
Dimension1.90 X 1.95 X 14.80
Ar15 AccessoryY
Other FeaturesMEDIUM TAPER, 1:10 TWIST, 4140 CHROME MOLY, SALT BATH NITRIDE FINISH, THREADED 1/2X28"
Other Features2RADIAL DELAYED BLOWBACK BOLT, REQUIRES ENLARGED EJECTION PORT FOR RELIABLE OPERATION, INCLUDES BOLT AND BARREL
Length In Inches5.0000

Determined at checkout.

Firearm Safety 101

Published: March 26, 2025

Firearm safety is a fundamental responsibility for all gun owners. Understanding and following basic gun safety rules can prevent accidents and ensure responsible firearm handling.

1. Treat Every Firearm as if It's Loaded

Even if you believe a firearm is empty, always handle it with caution. This mindset ensures proper respect for the weapon and reduces the risk of negligent discharge.

2. Keep Your Finger Off the Trigger

Never place your finger on the trigger unless you are ready to fire. This rule prevents accidental discharges, which can happen if your finger slips or if you are startled.

3. Store Firearms Securely

Use a gun safe or a secure locking mechanism to prevent unauthorized access. Always store ammunition separately to enhance safety.

4. Be Aware of Your Target and Beyond

Always know what is in front of and behind your target before pulling the trigger. Bullets can travel long distances and penetrate unintended objects.